<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>5_对象相关知识</title>
</head>
<body>
    <script type="text/javascript">
       function sum(a){
        return(b) => {
            return(c) => {
               return a + b + c
            }
        }
       }
     const result = sum(1)(2)(3)
     console.log(result)
 
    </script>
</body>
</html>